Oval fronts are less common in Ray-Ban's metal lineup than round or square ones, and the RB3547 uses one — paired with a 145mm arm in matching metal, which is what this aftermarket pair is cut to. The oval's continuous curve means the hinge sits at a slightly different angle than on the round-front 2447 or 3447, so the two aren't a drop-in swap for each other despite the shared 145mm length.

A common issue on oval and round metal arms alike is uneven wear from being handled mostly with one hand — the arm on the side you usually grip tends to loosen or bend slightly before the other. It's worth comparing both arms on the old pair before assuming both need replacing; often only one has actually failed, and it's fine to replace a single arm rather than the pair.

Frequently asked questions

How do I know these arms will fit my Ray-Ban frame?

These arms are made specifically for the 3547, matching its 145mm length and Oval hinge design, so they attach to your existing screws and hinge without any filing or adjustment needed.

My hinge feels loose — will new arms fix that, or is it the frame that's worn?

A new 145mm arm includes its own hinge barrel, so if the wobble is coming from worn threading on the arm side of the 3547, replacing it usually restores a snug, tight fold.

Do I need a specific screwdriver to attach these myself?

You'll need a small eyeglass screwdriver, typically included in basic repair kits, to remove the old hinge screw and attach the new 145mm arm to your 3547 frame — the whole swap usually takes under five minutes.

Can I replace just one arm, or do I have to buy both?

You can order a single side if only one arm on your 3547 is broken or scratched, or buy the pair if both need replacing — either way they match the 145mm length exactly.